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- Title
Paddy crop improvement through exogenously applied halotolerant potassium solubilizing plant growth promoting rhizobacteria under salt stressed conditions.
- Authors
Ashfaq, Muhammad; Hassan, Hasnuri Mat; Ghazali, Amir Hamzah Ahmad
- Abstract
Plant growth performance is adversely affected by soil salinity as excess sodium cations can cause osmotic stress in the plant grown under this condition. Potassium addition is proven to reduce sodium uptake; however, a such contribution from microorganisms in the paddy field system is not well understood. Hence, the beneficial effects of potassium solubilizing bacteria (KSB) on paddy (Oryza sativa L.) grown under saline conditions were investigated. Paddy was grown in a growth chamber with four potassium-solubilizing strains: Acinetobacter pittii, Rhizobium pusense, Cupriavids oxalaticus, and Ochrobactrum ciceri. Subsequently, in a pot experiment, paddy was grown with Acinetobacter pittii as the most efficient potassium solubilizing strain to assess their growth performance and capability to enhance nutrient concentration in the plant. Salinity stress significantly reduced seed germination, root colonization, shoot and root length, and shoot and root dry weight; however, the presence of potassium solubilizing bacteria (KSB) mitigated the adverse effects of salinity. Acinetobacter pittii had a greater effect in improving paddy growth except for chlorophyll contents. Acinetobacter pittii application significantly improved plant growth and nutrient concentrations compared to other strains. In the pot experiment, regardless of KSB inoculation, plant tissue's potassium and phosphorus concentrations were reduced in response to increased salinity, whereas sodium concentration increased. However, Acinetobacter pittii increased the concentrations of potassium and phosphorus and reduced sodium concentration in paddy plants. The application of KSB, particularly Acinetobacter pittii, could improve paddy growth by mitigating the harmful effects of salinity in a salt-stressed environment.
- Subjects
CROP improvement; PLANT growth; POTASSIUM; SOIL salinity; RHIZOBACTERIA
- Publication
Soil & Environment, 2022, Vol 41, Issue 2, p158
- ISSN
2074-9546
- Publication type
Article
- DOI
10.25252/SE/2022/242843